It’s the big boobs. It’s always the big boobs.What's weird is that some of these type of manga have a very distinctive artstyle like you'll know it's an ecchi one without even seeing the genre/tags
because it is always a hentai-artist, with only 3 - 4 works (unpopular?), the only difference between a manga-artist and hentai-artist, are the proportion of the body, boobs etc. (many manga-artist are bad/ make mistakes)What's weird is that some of these type of manga have a very distinctive artstyle like you'll know it's an ecchi one without even seeing the genre/tags